The Marconi IFR Aeroflex 2948B is a Communications Service Monitor that delivers integrated signal generation, analysis, and measurement capabilities for testing and maintaining communication systems across 400 kHz to 1.05 GHz. Built around a low phase noise signal generator, it enables FM receiver noise characterization and narrow-band receiver testing with signal-to-noise measurements exceeding 46 dB on 12.5 kHz channel spacing. The instrument combines field portability with laboratory-grade precision through a full-performance spectrum analyzer, tracking generator, and duplex operation as standard features.
Technical Specifications
Signal Generation
• Frequency range: 400 kHz to 1.05 GHz
• Output power: +5 dBm (+7 dBm overrange)
• Level accuracy: ±2 dB above −127 dBm
• Switching speed: Fast
• Phase noise: Low as standard
Signal Analysis
• Spectrum analyzer with spans from 100 Hz/division to 100 MHz/division
• Fully adjustable reference level
• Real-time display adjustment across dynamic range
• Tracking generator for duplexer and filter alignment
• Frequency offset facility for translation testing
• Channel stepping via increment definition
Power Measurement
• Measurement range: 2 µV to 150 W
• Accuracy: Better than 10% from 5 mW to 150 W on N-Type connector
• Direct 150 W measurement without external attenuators
• Low-level off-air and circuit probe capability
Modulation Analysis
• DTCSS, TONE REMOTE (optional), DCS, and CTCSS support
• User-defined tone format configuration
• Audio filtering: band pass, low pass, high pass (optional psophometric and simulated radio channel bandwidth filters available)
• Direct CTCSS measurement with 300 Hz low pass filter
– Key Features
• Full duplex operation with no offset restrictions
• Simultaneous repeater transmit and receive path testing
• Fast frequency switching for rapid diagnostics
– Typical Applications
• Base station and repeater commissioning and maintenance
• Duplex radio receiver and transmitter verification
• Narrow-band receiver noise performance validation
• Duplexer and filter alignment in field environments
– Compatibility & Integration
N-Type connector interface. Optional filter modules for extended modulation analysis.
